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Thanks guys. Just finished and heating working as should... I removed the pump fully (instead of just the motor head) and found the inlet 90% block and the outlet 70% block :shock: The pump is cast iron, so I'm not that surprised. It took 2.5 hours to clean of fully - anyway...

Good point I'll check - also maybe other elements of the pump restricted??? One thing though. All the radiators do work, but only individually I need to switch off all the others to raise the pressure to the single one, or two... Does the boiler switching off make sense?

Cheers Spraggo. isolating valves back on and bleed the pump. I only had to tap the pump once when a put it back together. It now runs but not sure how affective it is :oops: The system doesn't need pressurizing or anything (sorry from car mechanic background) does it? What is the...

Thanks Gasguru. The pump isn't a direct drive, it's an induction type. Myson (circulator SE 125). Any other thoughts on how I can check the pump?

I thought I'd start a new topic as I've made a some developments... My issue is my Radiators are not heating up and boiler switches off (too hot) prematurely. I worked out it must be a circulation fault. After removing the motor head from my pump, I found a thick solid residue motor side...

Thanks for the advice. Some further info. It's the radiators furtherest area both up and downstairs that are affected. The boiler seems to be cutting out prematurely (overheating) to get to working need to raise the internal boiler stat I'm not convinced the pump is making the right...

Thanks for the swift reply. Yes, the other 50% are getting nice and hot. Yes, all fitted with valves, and tried screwing them all the way in and out again and giving them a very light tap. In the last couple of weeks. Since switching the system on for winter really.

:oops: Hello All, Your advice please!! 3 radiators cold downstair cold including feed pipe. The same upstairs 3 radiator cold too. The system is an oil feed system with expansion tank in the loft. When the system first switches on there is a popping/banging noise as-though there is...